SMAJ180A

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Transient voltage suppressors (TVS) diodes are designed to protect electronic circuits against transients. Normally, these transients could be instantaneously elevated voltage levels, also known as surges or electrostatic discharge (ESD). As it stands, the SMAJ180A is leader in the TVS-Diodes market, and this article is primarily aimed to discuss the application field and related working principle.

The SMAJ180A is composed of one bidirectional, two unidirectional TVS, along with a zener diode in a single-package setup. An internal connection between the unidirectioanl and bidirectional diodes allows for two different working patterns; one for the protection of an IC from an ESD attack, and the other for protecting an IC from an overvoltage occurring in the downstream circuit. The device also has a built-in protection from surge radiation as high as 1800W (8/20)waveform, making it an ideal choice for applications with 50Ω/150Ω impedance.

The bidirectional characteristic of the TVS makes it extremely suitable for ESD events. Basically, when an overvoltage occurs, the SMAJ180A conducts current, thereby reducing the potential difference, and protecting the device. The two unidirectional TVS are used for overvoltage conditions, i.e. when the voltage becomes too high. In such cases, the increase in voltage automatically triggers a breakdown, which reaches to a point where the voltage difference is zero, thereby providing protection against shocks.

In addition to the bidirectional TVS, the SMAJ180A also features dual breakdown return voltage range to cover the most common ESD and surge protection needs. The IEC 61000-4-2 equipotentiality specification – the measurement of ESD immunity – for the device is ±2kV, and the IEC 61000-4-4 specified pulse formulation for its surge immunity is rated up to 8A. This combination provides excellent parasitic protection, and is perfect for systems that are constantly exposed to ESD events or increased levels of transients.

The low leakage current levels and extremely high pulse energy absorption capability of the SMAJ180A makes it extremely suitable for sensitive circuit protection in various fields, such as automotive and military applications, among others. The device also has excellent clamping performance, and can withstand severe surge stress. The 1500W minimum peak pulse power makes the SMAJ180A particularly suitable for high speed signal communication applications, where high impedance communication lines are involved.

To sum up, the SMAJ180A is an excellent choice for transient voltage protection. The bidirectional, two unidirectional, and zener diodes combination of the device makes it perfect for ESD and surge protection, while the 1500W minimum peak pulse power boosting its suitability for high speed signal communication systems. This makes the device an ideal solution for several commercial and industrial projects.

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